One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(9,13)(10,12)(11,14)(15,16)(17,18,23,27)(19,28,31,38)(20,25,33,43)(21,26,22,35)(24,36,39,30)(29,45,48,44)(32,41,34,42)(37,47,40,46)(4,11)(6,12)(7,14)(9,15)(17,19)(18,24)(20,29)(21,30)(22,36)(23,31)(25,40)(26,38)(27,39)(28,35)(32,46)(33,48)(34,47)(37,43)(41,45)(42,44) involution — undirected(1,3)(2,6)(4,9)(5,10)(7,13)(8,12)(11,15)(14,16)(17,20)(18,25)(19,29)(21,34)(22,32)(23,33)(24,37)(26,42)(27,43)(28,44)(30,47)(31,48)(35,41)(36,46)(38,45)(39,40) involution — undirected(1,4,5,11)(2,7,8,14)(3,9,10,15)(6,13,12,16)(17,21,23,22)(18,26,27,35)(19,30,31,36)(20,32,33,34)(24,38,39,28)(25,41,43,42)(29,46,48,47)(37,44,40,45)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.